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The preparation and chemical properties of barium-oxocuprat (I) inclusive the results of the crystal structure determination by single crystal X-ray investigations are described. BaCu 2 O 2 crystallizes isotypically with SrCu 2 O 2 . (a = 5.72 and c = 10.06 Å. Spacegroup : D 19 4h - 14 1 /amd.) The influence of the bigger Ba 2⨁ -ion on the oxigenconfiguration surrounding the cations is discussed. It seems that the stretched O - Cu - O-dumbell is an invariable structural element in the oxocompounds of copper (I), which is shown by comparison of already known oxocuprates (I) . Only the way of interchainment varies evidently with stoichiometry.
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Teske et al. (1972) studied this question.
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